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pcap_geterr(3) [netbsd man page]

PCAP_GETERR(3)						     Library Functions Manual						    PCAP_GETERR(3)

pcap_geterr, pcap_perror - get or print libpcap error message text SYNOPSIS
#include <pcap/pcap.h> char *pcap_geterr(pcap_t *p); void pcap_perror(pcap_t *p, char *prefix); DESCRIPTION
pcap_geterr() returns the error text pertaining to the last pcap library error. NOTE: the pointer it returns will no longer point to a valid error message string after the pcap_t passed to it is closed; you must use or copy the string before closing the pcap_t. pcap_perror() prints the text of the last pcap library error on stderr, prefixed by prefix. SEE ALSO
pcap(3) 5 April 2008 PCAP_GETERR(3)

Check Out this Related Man Page

PCAP_COMPILE(3) 					     Library Functions Manual						   PCAP_COMPILE(3)

pcap_compile - compile a filter expression SYNOPSIS
#include <pcap/pcap.h> int pcap_compile(pcap_t *p, struct bpf_program *fp, const char *str, int optimize, bpf_u_int32 netmask); DESCRIPTION
pcap_compile() is used to compile the string str into a filter program. See pcap-filter(7) for the syntax of that string. program is a pointer to a bpf_program struct and is filled in by pcap_compile(). optimize controls whether optimization on the resulting code is per- formed. netmask specifies the IPv4 netmask of the network on which packets are being captured; it is used only when checking for IPv4 broadcast addresses in the filter program. If the netmask of the network on which packets are being captured isn't known to the program, or if packets are being captured on the Linux "any" pseudo-interface that can capture on more than one network, a value of PCAP_NET- MASK_UNKNOWN can be supplied; tests for IPv4 broadcast addreses will fail to compile, but all other tests in the filter program will be OK. RETURN VALUE
pcap_compile() returns 0 on success and -1 on failure. If -1 is returned, pcap_geterr() or pcap_perror() may be called with p as an argu- ment to fetch or display the error text. SEE ALSO
pcap(3), pcap_setfilter(3), pcap_freecode(3), pcap_geterr(3), pcap-filter(7) 5 April 2008 PCAP_COMPILE(3)
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